I see, for example, Galacticraft for 1.8.9 requires Forge 11.15.1.1764 but the RB build is 1722. In that case, i choose the Latest build or Build 1764 from the more versions tab? (Note that the RB is not compatible)
EDIT: For 1.8.9, 1.9, 1.9.4, 1.10.2, 1.11 and 1.11.2 i will use the Latest Build, but for 1.12.2 i will use the recommended because it updates every day!
@diesieben07 I went to send you a message to add an item to the "common problems list" (trying to reference Items in block constructors) and I was unable to send a new message because my "inbox is full, delete some messages then try again." I have reduced my PM count from over 180 down to 36 and I still cannot send messages.
I attempted to contact Invsion Power Services about this problem, but apparently only the forum owner (the person who actually paid to use this software) can submit bug reports (what a load of crock). I assume that is Lex, but I have no idea, and can't ask him because my inbox is full.
Right now, everything from 1.8.9 and higher are supported on this forum. However, we strongly encourage modders to use the latest version.
As for which build to use: the release of the first recommended build is when most modders start updating their mods. After that, it's relatively safe to use the latest Forge version.
I'd say you should always use the latest recommended build, unless a mod specifies otherwise.